Loose punch.



G. H. CLARK. LOOSE PUNCH. APPLICATION FILED MAR. 2'2, 1907.

915,659. I Patented Mar. 16, 1909.

:7 I is I as um|||||u-\\\ 68 fW1TNESsES.- INVENTOR.

rin rrnn STATES PATENT OFFICE.

CHARLES nouns CLARK, or GRAFTON, PEriN'sYLvANIA.

LQQSE PUNCH.

Specification of LettersPatent.

atented March 1 6,.1-909-.

Application filed March 22 1907. Serial No. 363,891.

The object of the invention is the provi;

sion of a loose punch adapted to pass through and drop from the holewhich it cuts, said punch being of such configuration as to maintainthroughout'its length the greatest possible cross sectional area in apunch of this character. A further object of the invention is theprovision of a loose punch of the character setforth and having planeupper-and lower faces by virtue of which the punch will maintain itselfin an upri ht positionwhen placed'upon the materia tobe punched. Thisarrangement of plane faces also renders it possible to use a pluralityof punches adapted to be acted upon byv a rain of such areaas to overliea plurality of punches.

Since any portion of the surface of a fiat ram,

is adapted to coact with the plane upper faces to the punches, it isapparent that the position of the punches may 'bevaried at will tothereby vary the location of the holes to be punched in the material.

A further object of the invention is to eliminate the necessity ofstripping the material from the punch and to provide punches of varyinglengths adapted to be acted upon by a ram'common to all of theni,wherebythc pressure required to force the punches through the. metal isdelivered g 0 through a greater duration of time, thus greatly reducingthe work per unit of time,

and making the total work of the ram more uniform.

Further objects and advantages of the in- 46 vention will be set forthin the detailed description which now follows. In thcaccompanyindrawing, Figure 1 is a plan view of a punc and the arts connectedtherewith, and Fig. 2 is a view partly .50 in section and partly in sideelevation on application for patent for a' machine for punching holes inmetal plates, or other punching machine and a.

structural material, filed. Feb. 26, 1907, Serial No. 360,061, and inwhich these punching tools are shown.

Like numerals "designate corresponding;-

parts in both of the figures of the drawing. I

Referring to the drawing, the numerals 63 designate the jawsmf apunching machine,

said punching machine. being provided with the usual vertically movableram2, said ramhaving a plane lower face. A die templet 29 .isremovablymounted u on; the lower jaw 63, and carries a die 9. Thedietemplet is provided with upturned bifurcated jaws which are adaptedto receive horizontally projecting. pins of a punch templct 31.This-punch 'templet has an openin formed therein whichis adapted toreceivet e punch- 7 which forms" the' subject matter of the It isapparent thatnpon the descent ofthe ram 2, with sufici-ent presentinvention.

force, the punch 7 will be forcedthr'ough thematerial 8, and after it isfree of said mate rial, will drop through the openingof die 9,

said punch following the slu which has been punched from the inateria,through said die. Any convenient means for catching thepunches below themachine, separating them from the slugs'and returning them to aconvenient point for re-use, may be employed.

The punch 7 has plane upper andlower faces. This punch will thereforemaintain itself in an upright position upon the mate'- rial to bepunched, its location upon said material being determined by thelocationof the opening in the punch tem let. Since the ram 2 is likewiseprovided wit aplane lower face, it will be seen that the thrust upon thepunch is a direct vertical thrust and that consequently there is notendency for the punch to turn over. The provision of these plane upperand lower faces in a'loosepunch, or :a punch which has no externalsupport, is an 1m ortant feature. sis best illustrated inFig. 2, theshank of the punch is longitudinally curved throughout a portion ofits'length and is straight throug out the remainder of its length. Thisstructure is likewise a very important one, for the following reasons:Assoonas the unch begins to penetrate the: metal, the ma= terialaround theup er edge of the hole being;

punched, tends toow inwardly thereby decreasing to aslight' extent thediameter of the If the punch were. perfectly straight, I

hole. it is apparent that'this inflow of the metal shank of the i wouldbind upon theshank of the punch and prevent it from fallin freely fromthe machine. Upon the ot er hand, where the Ipunch is tapered from en toend, the punc is unduly weakened for is only necessary to reduce thepunch from the lower face to a point which lies about at the upper faceof the material at the completion of the punching operation. From thatpoint, the shankof the punch may be straight. This renders it possibletosecure the greatest degree. of strength in a' punch of this character,and results in reducing the fiber strains in the punch. It is apparentthat 31 may have holes for corresponding punches to thereby unch two ormore holes at one operation 0 ram 2. Where a plurality of quired toforce the punches -t punches are used, I prefer to make them of varyinglengths to reduce the ressure rerough the material.

- The provision of the bifurcated extensions "for engaging the pins ofthe punch templet 31 enders said punch templet freelyv adjustable withrelation to the die templet. Pieces 8 of varying. sizes -may thereforebe inserted between the punch templets and the dies while maintainingsaid punch templets in a horizontal plane. Since both the punch and dietemplets are removable, it is apparent that other and similar partscarrying the proper dies and punches may-be substituted therefor when itis desired to' unch holes of differ vent sizes and shapes or ocation.

From the foregoing description, it will be seen that simplean'deflicient means are herein provided for accom lishing the objects of theinvention, but wh e the elements shown and describedare well adaptedtoserve the purposesfor which they are intended, it is to the head andthe base.

e understood that the invention is not lin1- itedto the preciseconstruction setforth, but includes within its purview, such changes asmay be made within. the scope of the appended claims.

Hav' g described my invention, what I claim is 1. A loose unch adaptedto pass entirely through the iole which it cuts and having a head and a.base of greater area than the head, and a-shank portion the surface ofwhich lies inside .of a straight line between 2. A loose punch adaptedto pass entirely through the hole which it cuts,-

said punch havm a flat head and a flat base of greater area tan thehead, and a shank portion, the

surface of which lies inside of a straight line between the head-and the3. The" combination loose unches ada ted to pass completely throug theholes w 'ch theycut, of a ram of base.

such area as to overlie a p uralitv of said punches'simultaneously',said punches being of varying lengths. I

4. The combination with plurality of loose punches adapted topasscompletely throu h the holes which they cut, of a ram of suc area'as tooverlie a lurality of said punclies simultaneously, sai unches being ofvaryiru lengths, and the ower faces of reater area than would present.

5. The combination with a plurality of loose punches adapted to passcompletely through the holes which-they cut, of a ramof such area as tooverlie a lurality of said punches simultaneously, said punches being ofvarying lengths, the lower faces of sai punches presenting a greaterarea than any cross section through said bunches would present, andtheshanks of said punches being ongitudinally andinwardly curved.

6. The combination with, a plurality of loose throng the holeswbich theycut, of a ram of such area as to overlie a plurality of said punchessimultaneously, said punches being of varying lengths, the lower facesof said,

punches presenting a greater area than any cross section through saidpunches would resent, the shanks of said punches being lhngitudinallyandinwardly curved, and said punches having plane upper and lower faces7. The loose punch for punching holes in metal and adapted to passentirely through the hole which it cuts, said punch having plane upperand lower faces connected by a ongitudinally curved'shank.

8. A punch comprising-a shank portion.

and upper and lower faces, the lower face resenting a greater area thanthe upper ace and said shank being inwardly and longitudinally curvedfor a portion of its length, and straight for theremainder 'of itslength.

9. A loose punch adapted to pass entirely through the hole which it cutshavin plane upper and lower faces and a shank the surface of whichlies'inside of a strai ht line between the edges of the upper and owerfaces.

10. The combination with a unch adapted to pass completely through t ehole which it cuts, of a die tern let, a punch templet adapted tomaintain t e loose punch in ahnement, said punch templet being connecteddie templet.

with a plurality of unches adapted to pass completely 11. A plurality ofloose punches ada ted metal= plates adapted to pass conipletelii to passcompletely through the holes w 'ch through the hole which it cuts, saidpunc they cut, said unohes bein of varying having a plane upper face anda lower cute lengths substantially as descri ed. ting edge, the areaincluded by the cuttin 15 5 2- ..12. Aloose punchedapted to pass throughedge being greater than would be include the hole which it cuts incombination with a in any cross section through the punch parram havingan operating surface adapted to allel to said cutting edge. 1 7 act uponsaid punch-,any portion of said CHARLES HOMER CLARK.

operating'surface' being adapted to engage Witnesses; 10 said punch foroperating the same. BERTHA PENoE,

O. H. Mosmn.

13. A loose punch for punching holes in

